Extender EX2700 reverted to original name and unable to login

I have two extenders which I have been using for about a year. Last week, one of them suddenly reverted back to the generic netgear ext name and does not connect to the internet. First, I tried to login to it and reconnect but when I did it required me to go through the set-up again creating the username and password and entering security answers. I did this. When I hit next, it takes me to the login screen. I enter the username and password but it does move to the next screen instead it just asks again for username and password. So, then I tried a factory reset - this resulted in the same thing happening. So I am unable to get past the login screen on the extender.